
jQuery.extend({


	createUploadIframe: function(id, uri)
	{
		//create frame
		var frameId = 'jUploadFrame' + id;
		var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
		if(window.ActiveXObject)
			{
			if(typeof uri== 'boolean'){
				iframeHtml += ' src="' + 'javascript:false' + '"';
			}
			else if(typeof uri== 'string'){
				iframeHtml += ' src="' + uri + '"';
			}
		}
			iframeHtml += ' />';
			jQuery(iframeHtml).appendTo(document.body);

		return jQuery('#' + frameId).get(0);
	},
	createUploadForm: function(id, fileElementId, data)
	{
		//create form
		var formId = 'jUploadForm' + id;
		var fileId = 'jUploadFile' + id;
		var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
		if(data)
		{
			for(var i in data)
			{
				jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
			}
		}
		var oldElement = jQuery('#' + fileElementId);
		var newElement = jQuery(oldElement).clone();
		jQuery(oldElement).attr('id', fileId);
		jQuery(oldElement).before(newElement);
		jQuery(oldElement).appendTo(form);



		//set attributes
		jQuery(form).css('position', 'absolute');
		jQuery(form).css('top', '-1200px');
		jQuery(form).css('left', '-1200px');
		jQuery(form).appendTo('body');
		return form;
	},

	ajaxFileUpload: function(s) {
	// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
	s = jQuery.extend({}, jQuery.ajaxSettings, s);
	var id = new Date().getTime()
		var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data));
		var io = jQuery.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId = 'jUploadForm' + id;
	// Watch for a new set of requests
	if ( s.global && ! jQuery.active++ )
		{
			jQuery.event.trigger( "ajaxStart" );
		}
	var requestDone = false;
	// Create the request object
	var xml = {}
	if ( s.global )
		jQuery.event.trigger("ajaxSend", [xml, s]);
		// Wait for a response to come back
	var uploadCallback = function(isTimeout)
		{
			var io = document.getElementById(frameId);
		try
			{
				if(io.contentWindow)
				{
					xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
					xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
				}else if(io.contentDocument)
				{
					xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
					xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
				}
		}catch(e)
			{
				jQuery.handleError(s, xml, null, e);
			}
		if ( xml || isTimeout == "timeout")
		{
			requestDone = true;
			var status;
		try {
			status = isTimeout != "timeout" ? "success" : "error";
			// Make sure that the request was successful or notmodified
			if ( status != "error" )
			{
				// process the data (runs the xml through httpData regardless of callback)
				var data = jQuery.uploadHttpData( xml, s.dataType );
				// If a local callback was specified, fire it and pass it the data
				if ( s.success )
					s.success( data, status );

				// Fire the global callback
				if( s.global )
					jQuery.event.trigger( "ajaxSuccess", [xml, s] );
			} else
				jQuery.handleError(s, xml, status);
			} catch(e)
				{
			status = "error";
			jQuery.handleError(s, xml, status, e);
		}

		// The request was completed
		if( s.global )
			jQuery.event.trigger( "ajaxComplete", [xml, s] );

		// Handle the global AJAX counter
		if ( s.global && ! --jQuery.active )
			jQuery.event.trigger( "ajaxStop" );

		// Process result
		if ( s.complete )
			s.complete(xml, status);

		jQuery(io).unbind()

		setTimeout(function()
			{	try
			{
				jQuery(io).remove();
				jQuery(form).remove();

			} catch(e)
			{
				jQuery.handleError(s, xml, null, e);
			}

		}, 100)

		xml = null

		}
	}
	// Timeout checker
	if ( s.timeout > 0 )
		{
		setTimeout(function(){
		// Check to see if the request is still happening
		if( !requestDone ) uploadCallback( "timeout" );
		}, s.timeout);
	}
	try
		{

			var form = jQuery('#' + formId);
			jQuery(form).attr('action', s.url);
			jQuery(form).attr('method', 'POST');
			jQuery(form).attr('target', frameId);
		if(form.encoding)
			{
				jQuery(form).attr('encoding', 'multipart/form-data');
		}
		else
			{
				jQuery(form).attr('enctype', 'multipart/form-data');
		}
		jQuery(form).submit();

	} catch(e)
		{
		jQuery.handleError(s, xml, null, e);
	}

		jQuery('#' + frameId).load(uploadCallback	);
	return {abort: function () {}};

	},

	uploadHttpData: function( r, type ) {
		var data = !type;
		data = type == "xml" || data ? r.responseXML : r.responseText;
		// If the type is "script", eval it in global context
		if ( type == "script" )
		jQuery.globalEval( data );
		// Get the JavaScript object, if JSON is used.
		if ( type == "json" ) {
			data = data.replace("<pre style=\"word-wrap: break-word; white-space: pre-wrap;\">","");
			data = data.replace("</pre>","");
			eval( "data = " + data );
		}
		// evaluate scripts within html
		if ( type == "html" )
			jQuery("<div>").html(data).evalScripts();

		return data;
	}
})

